XMVector4Refract method

Syntax

Parameters

Incident [in]

4D incident vector to refract.

Normal [in]

4D normal vector to refract the incident vector through.

RefractionIndex [in]

Index of refraction. See remarks.

Return value

Returns the refracted incident vector. If the refraction index and the angle between the incident vector and the normal are such that the result is a total internal reflection, the function will return a vector of the form < 0.0f, 0.0f, 0.0f, 0.0f >.

The index of refraction is the ratio of the index of refraction of the medium containing the incident vector to the index of refraction of the medium being entered (where the index of refraction of a medium is itself the ratio of the speed of light in a vacuum to the speed of light in the medium).